What is meaning of "dejavu" ? what is that?

At the edge of the lawn, behind the building, there was a line of underbrush and trees sloping down a hillside. beyond that, there was a playground next to a day-care center. they could hear shouts of children in the air, and when they looked through the underbrush, they could see bundled-up four-year-olds swinging on swings and racing around a playhouse. the operation would be carried out near children.     –the hot zone,richard prestonwhat is the author’s purpose for including this paragraph? check all that apply.to express his thoughts clearlyto inform readers about the location  to persuade readers to become scientiststo entertain readers by showing how dramatic the situation isto encourage readers to protect children